Re: how to use sctp_sendmsg to send ABORT chunk

[Vlad Yasevich <vyasevich@gmail.com>]

On 11/23/2012 11:55 PM, СºØ wrote:
> dear  lksctp Project,
>    i met a problem about sending abort chunk. if you have time, please help me.       i'm using the lksctp to develop my function, which is for sending Abort chunk.        platform of my development : Redhat centos 5.5 and verion  of linux kernel is 2.18.        according to "man sctp_sendmsg", just set flags to SCTP_ABORT.        my partial code.--------------------------------------------------------------------------------------------------------------------------struct msghdr msg;struct cmsghdr cmsg; struct iovec iov;        static char error_code= 12;	iov.iov_base = &error_code;	iov.iov_len = 1;cmsg.cmsg_level = IPPROTO_SCTP;cmsg.cmsg_type = SCTP_SNDRV;cmsg.cmsg_len = sizeof(struct cmsghdr);msg.msg_name = (SOCKADDR*)&serAddr;	msg.msg_namelen = sizeof(serAddr);	msg.msg_iov = &iov;	msg.msg_iovlen = 1;	msg.msg_control = &cmsg;	msg.msg_controllen = sizeof(cmsg);        ret = sctp_sendmsg(sock_fd, (void*)&msg, sizeof(msg), (SOCKADDR*)&serAddr,                                   sizeo
f(serAddr),sri.sinfo_ppid, (SCTP_ABORT),                           sri.sinfo_stream, sri.sinfo_timetolive,sri.sinfo_context);--------------------------------------------------------------------------------------------------------------------but the ret < 0 and the errno is 22 that is invalid agument.please tell which argument is error and how to set cause of abort chunk into "struct msghdr" best regardsthank you fangmin.cao

First, the msg argument is just a buffer to send, not a msghdr.  Second 
the SCTP_ABORT is set in the flags parameter of sctp_sendmsg().  Third,
SCTP_ABORT is not supported on a SOCK_STREAM socket.
That should get you what you want.

-vlad